Source Code Cross Referenced for DomUtil.java in  » Library » Apache-commons-modeler-2.0.1-src » org » apache » commons » modeler » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache commons modeler 2.0.1 src » org.apache.commons.modeler.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.commons.modeler.util;
018:
019:        import java.io.IOException;
020:        import java.io.InputStream;
021:        import java.io.OutputStream;
022:        import java.io.StringReader;
023:
024:        import javax.xml.parsers.DocumentBuilder;
025:        import javax.xml.parsers.DocumentBuilderFactory;
026:        import javax.xml.parsers.ParserConfigurationException;
027:        import javax.xml.transform.OutputKeys;
028:        import javax.xml.transform.Transformer;
029:        import javax.xml.transform.TransformerException;
030:        import javax.xml.transform.TransformerFactory;
031:        import javax.xml.transform.dom.DOMSource;
032:        import javax.xml.transform.stream.StreamResult;
033:
034:        import org.w3c.dom.Document;
035:        import org.w3c.dom.NamedNodeMap;
036:        import org.w3c.dom.Node;
037:        import org.xml.sax.EntityResolver;
038:        import org.xml.sax.InputSource;
039:        import org.xml.sax.SAXException;
040:
041:        /**
042:         *  Few simple utils to read DOM
043:         *
044:         * @author Costin Manolache
045:         */
046:        public class DomUtil {
047:            private static org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory
048:                    .getLog(DomUtil.class);
049:
050:            // -------------------- DOM utils --------------------
051:
052:            /** Get the trimed text content of a node or null if there is no text
053:             */
054:            public static String getContent(Node n) {
055:                if (n == null)
056:                    return null;
057:                Node n1 = DomUtil.getChild(n, Node.TEXT_NODE);
058:
059:                if (n1 == null)
060:                    return null;
061:
062:                String s1 = n1.getNodeValue();
063:                return s1.trim();
064:            }
065:
066:            /** Get the first element child.
067:             * @param parent lookup direct childs
068:             * @param name name of the element. If null return the first element.
069:             */
070:            public static Node getChild(Node parent, String name) {
071:                if (parent == null)
072:                    return null;
073:                Node first = parent.getFirstChild();
074:                if (first == null)
075:                    return null;
076:
077:                for (Node node = first; node != null; node = node
078:                        .getNextSibling()) {
079:                    //System.out.println("getNode: " + name + " " + node.getNodeName());
080:                    if (node.getNodeType() != Node.ELEMENT_NODE)
081:                        continue;
082:                    if (name != null && name.equals(node.getNodeName())) {
083:                        return node;
084:                    }
085:                    if (name == null) {
086:                        return node;
087:                    }
088:                }
089:                return null;
090:            }
091:
092:            public static String getAttribute(Node element, String attName) {
093:                NamedNodeMap attrs = element.getAttributes();
094:                if (attrs == null)
095:                    return null;
096:                Node attN = attrs.getNamedItem(attName);
097:                if (attN == null)
098:                    return null;
099:                return attN.getNodeValue();
100:            }
101:
102:            public static void setAttribute(Node node, String attName,
103:                    String val) {
104:                NamedNodeMap attributes = node.getAttributes();
105:                Node attNode = node.getOwnerDocument().createAttribute(attName);
106:                attNode.setNodeValue(val);
107:                attributes.setNamedItem(attNode);
108:            }
109:
110:            public static void removeAttribute(Node node, String attName) {
111:                NamedNodeMap attributes = node.getAttributes();
112:                attributes.removeNamedItem(attName);
113:            }
114:
115:            /** Set or replace the text value 
116:             */
117:            public static void setText(Node node, String val) {
118:                Node chld = DomUtil.getChild(node, Node.TEXT_NODE);
119:                if (chld == null) {
120:                    Node textN = node.getOwnerDocument().createTextNode(val);
121:                    node.appendChild(textN);
122:                    return;
123:                }
124:                // change the value
125:                chld.setNodeValue(val);
126:            }
127:
128:            /** Find the first direct child with a given attribute.
129:             * @param parent
130:             * @param elemName name of the element, or null for any 
131:             * @param attName attribute we're looking for
132:             * @param attVal attribute value or null if we just want any
133:             */
134:            public static Node findChildWithAtt(Node parent, String elemName,
135:                    String attName, String attVal) {
136:
137:                Node child = DomUtil.getChild(parent, Node.ELEMENT_NODE);
138:                if (attVal == null) {
139:                    while (child != null
140:                            && (elemName == null || elemName.equals(child
141:                                    .getNodeName()))
142:                            && DomUtil.getAttribute(child, attName) != null) {
143:                        child = getNext(child, elemName, Node.ELEMENT_NODE);
144:                    }
145:                } else {
146:                    while (child != null
147:                            && (elemName == null || elemName.equals(child
148:                                    .getNodeName()))
149:                            && !attVal.equals(DomUtil.getAttribute(child,
150:                                    attName))) {
151:                        child = getNext(child, elemName, Node.ELEMENT_NODE);
152:                    }
153:                }
154:                return child;
155:            }
156:
157:            /** Get the first child's content ( ie it's included TEXT node ).
158:             */
159:            public static String getChildContent(Node parent, String name) {
160:                Node first = parent.getFirstChild();
161:                if (first == null)
162:                    return null;
163:                for (Node node = first; node != null; node = node
164:                        .getNextSibling()) {
165:                    //System.out.println("getNode: " + name + " " + node.getNodeName());
166:                    if (name.equals(node.getNodeName())) {
167:                        return getContent(node);
168:                    }
169:                }
170:                return null;
171:            }
172:
173:            /** Get the first direct child with a given type
174:             */
175:            public static Node getChild(Node parent, int type) {
176:                Node n = parent.getFirstChild();
177:                while (n != null && type != n.getNodeType()) {
178:                    n = n.getNextSibling();
179:                }
180:                if (n == null)
181:                    return null;
182:                return n;
183:            }
184:
185:            /** Get the next sibling with the same name and type
186:             */
187:            public static Node getNext(Node current) {
188:                String name = current.getNodeName();
189:                int type = current.getNodeType();
190:                return getNext(current, name, type);
191:            }
192:
193:            /** Return the next sibling with a given name and type
194:             */
195:            public static Node getNext(Node current, String name, int type) {
196:                Node first = current.getNextSibling();
197:                if (first == null)
198:                    return null;
199:
200:                for (Node node = first; node != null; node = node
201:                        .getNextSibling()) {
202:
203:                    if (type >= 0 && node.getNodeType() != type)
204:                        continue;
205:                    //System.out.println("getNode: " + name + " " + node.getNodeName());
206:                    if (name == null)
207:                        return node;
208:                    if (name.equals(node.getNodeName())) {
209:                        return node;
210:                    }
211:                }
212:                return null;
213:            }
214:
215:            public static class NullResolver implements  EntityResolver {
216:                public InputSource resolveEntity(String publicId,
217:                        String systemId) throws SAXException, IOException {
218:                    if (log.isTraceEnabled())
219:                        log
220:                                .trace("ResolveEntity: " + publicId + " "
221:                                        + systemId);
222:                    return new InputSource(new StringReader(""));
223:                }
224:            }
225:
226:            public static void setAttributes(Object o, Node parent) {
227:                NamedNodeMap attrs = parent.getAttributes();
228:                if (attrs == null)
229:                    return;
230:
231:                for (int i = 0; i < attrs.getLength(); i++) {
232:                    Node n = attrs.item(i);
233:                    String name = n.getNodeName();
234:                    String value = n.getNodeValue();
235:
236:                    if (log.isTraceEnabled())
237:                        log.trace("Attribute " + parent.getNodeName() + " "
238:                                + name + "=" + value);
239:                    try {
240:                        IntrospectionUtils.setProperty(o, name, value);
241:                    } catch (Exception ex) {
242:                        ex.printStackTrace();
243:                    }
244:                }
245:            }
246:
247:            /** Read XML as DOM.
248:             */
249:            public static Document readXml(InputStream is) throws SAXException,
250:                    IOException, ParserConfigurationException {
251:                DocumentBuilderFactory dbf = DocumentBuilderFactory
252:                        .newInstance();
253:
254:                dbf.setValidating(false);
255:                dbf.setIgnoringComments(false);
256:                dbf.setIgnoringElementContentWhitespace(true);
257:                //dbf.setCoalescing(true);
258:                //dbf.setExpandEntityReferences(true);
259:
260:                DocumentBuilder db = null;
261:                db = dbf.newDocumentBuilder();
262:                db.setEntityResolver(new NullResolver());
263:
264:                // db.setErrorHandler( new MyErrorHandler());
265:
266:                Document doc = db.parse(is);
267:                return doc;
268:            }
269:
270:            public static void writeXml(Node n, OutputStream os)
271:                    throws TransformerException {
272:                TransformerFactory tf = TransformerFactory.newInstance();
273:                //identity
274:                Transformer t = tf.newTransformer();
275:                t.setOutputProperty(OutputKeys.INDENT, "yes");
276:                t.transform(new DOMSource(n), new StreamResult(os));
277:            }
278:        }
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